Lease bar for orienting warp threads



y 1960 H. HIRSCHBURGER 2,935,780

LEASE BAR FOR ORIENTING WARP THREADS Filed July 2, 1958 INVENTOR. H4 Nsf'flesch's UIE'GEE BY g A TI'O/PNEY LEASE BAR FOR ORIENTING WARP THREADS Hans I-Iirschburger, Duebendorf, Switzerland, assignor to nitcd States Patent lice Zellweger A.G., Apparateund Maschinenfabriken V Uster, Uster, Switzerland, a corporation of Switzerland Application July 2, 1958, Serial No. 746,132

Claims priority, application Switzerland July 6, 1957 3 Claims. (CI. 28-40) In the case of a warp tying machine or a drawing-in machine wherein a plurality of parallel threads in the form of a warp are subjected to textile operations, the threads are maintained in the desired predetermined or parallel arrangement or sequence by theinterposition of a lease rod. This lease rod must be positioned relative to the thread separating means of the above machines in a particular fashion in order to enable the usual so-called lease bar arrangement to be employed in which two lease rods are employed adjacent to each other with alternate threads passing over and under the respective adjacent lease rods, and vice versa, thus forming a line of intersection of said threads as shown in the drawing. Moreover, the lease bar also serves to straighten out those threads which may have become twisted about each other at a point removed from the line of intersection. Such lease bar arrangements until now were ordinarily formed simply of cylindrical or elliptical bar stock. Lease rods having such cross section have the disadvantage that on rotation about their longitudinal axes the threads are found to change their lateral position or point of contact continually while at the same time this point of contact cannot be brought any more closely to the line of intersection of the several threads comprising the warp. The result is, of course, that those threads which may have become twisted about each other cannot be easily disentangled and brought to lie in a parallel position by the rotary motion of such a lease rod.

It is, therefore, an important object of this invention to provide a lease rod for. guiding a plurality of intersecting threads lying in the form of a warp which enables said moving threads to remain in parallel position and to retain that relative position on the rotary movement of said lease rod about its longitudinal axis.

Other objects of this invention will appear from the following detailed description.

In the drawing,

Fig. l is a view in cross section of a pair of lease rods of circular cross section in the manner in which they are commonly in use showing the warp threads and their line of intersection as they pass over and under the respective lease rods,

Fig. 2 is a view in cross section of a pair of lease rods such as are commonly in use, these. being elliptical in cross section and also showing the intersecting threads,

Fig. 3 is a view in cross section of a pair of lease rods in accordance with the present invention whose novel cross sectional configuration is a feature of this invention and also showing the manner in which the intersecting threads of a warp coming in contact with said novel lease rods touch the surfaces thereof, and

Fig. 4 is a modification of the lease rods shown in Fig. 3.

Like numerals indicate like parts throughout the drawing.

7 2,935,780 Patented May 10, 1 960 points at which the threads are in contact with the lease rod 6 there is always the possibility that two or more of the threads may become twisted about each other. It can be readily observed that the mere rotation of the lease rod about its longitudinal axis will not alter the relative position of the threads and, therefore, will not necessarily free any twisted threads.

While a lease rod 8 of elliptical cross section as shown in Fig. 2 is a substantial improvement over that of circular cross section since the point of contact of the threads with the surface of the lease rod is closer to the point 7 at which the threads intersect, it has also been observed that the rotation of the lease rod about its longitudinal axis still permits the several threads continually to wander across the surface of the guide bar 8 which makes the disentanglement of those threads which are twisted about each other quite diflicult.

However, in accordance with the embodiment of this invention as shown in Fig. 3, the lease rod 9 is roughly cruciform in shape and is provided with a plurality of ridges 10, 11, 12 and 13 which are sharply angled at their extremities and are also made quite smooth in order to avoid damage to the threads. This shape contributes so substantially to the strength and stability of the lease rod that it may be formed satisfactorily not only of metal but of wood as well. The ridges of this cruciform structure are connected by the intermediate concave surfaces 14 whose curvature should not be too great where a lease rod of maximum cross section is desired.

With a lease rod formed in this fashion, or as shown in Fig. 4, which comprises another embodiment of this invention, it is always possible to maintain the ridges 10 (or 12 as the case may be) very close to the point of intersection 15 of the threads passing over the lease rod. Thus, by rotating the lease rod about its longitudinal axis, any entangled threads in the immediate vicinity of the point at which the threads intersect can be easily disentangled. In addition, it is also apparent that the threads of the warp, when the lease rod 9 is rotated about its longitudinal axis, will drop suddenly from one ridge of the lease rod to another since the threads do not come into contact with any portion of the intermediate concave surfaces. This movement acts very conveniently and efiectively to cause any threads which may have become entangled about each other to become disentangled readily, since the taut threads are first tightened and are then suddenly slackened as the lease rod is rota-ted.

It will be apparent from the foregoing that many variations may be made in this novel lease bar arrangement as described above without departing from the spirit of this invention.

I claim:

1. Thread guide means for guiding a plurality of threads and dividing said thread while maintaining said threads in substantially parallel alignment, comprising a pair of lease rods in parallel alignment having a substantially symmetrical cruciform cross section in which one arm is longer than the other and adapted to pass said threads from the longer arm of the one lease rod to that of the other. 7

2. Thread guide means as described in claim wherein .N s a 4 the threads passing over said lease rods are in point to References Cited in the file of this patent ggilitmggntact only with the ridges ofthe cruciform -7 .7 FOREIGN PATENTS 3. Thread guide means as described in claim 2 wherein 54 S itzerland Dec. 2, 1929 the surface of said lease rods intermediate of the points of 5 ,603 Ireland May 25, 1886 thread contact are concave in shape. 752,169 Great Britain July 4, 1956 

